Liroconite
Mineral Cu2Al(AsO4)(OH)4·4H2O
Take care.
- Contains arsenic: Wash your hands after handling it, don't make dust, and never heat it.
About it
Sky-blue, lens-shaped crystals from the old copper mines of Cornwall, especially Wheal Gorland; one of the great classic British minerals.
- Type
- Mineral
- Group
- Arsenate
- Formula
- Cu2Al(AsO4)(OH)4·4H2O
- Hardness (Mohs)
- 2–2.5
- Specific gravity
- 2.93–2.95
- Streak
- pale blue
- Lustre
- vitreous (glassy), resinous
- Crystal system
- Monoclinic
- Colours
- sky blue, deep blue, bluish green
- Transparency
- transparent, translucent
- Cleavage and fracture
- indistinct; conchoidal to uneven fracture
Typical values: real specimens vary. For more, see mindat.org.